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watertight

[waw-ter-tahyt, wot-er-] /ˈwɔ tərˌtaɪt, ˈwɒt ər-/
adjective
1.
constructed or fitted so tightly as to be impervious to water:
The ship had six watertight compartments.
2.
so devised or planned as to be impossible to defeat, evade, or nullify:
a watertight contract; a watertight alibi.
Origin of watertight
1350-1400
Middle English word dating back to 1350-1400; See origin at water, tight
Related forms
watertightness, noun
nonwatertight, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for watertight

watertight

/ˈwɔːtəˌtaɪt/
adjective
1.
not permitting the passage of water either in or out: a watertight boat
2.
without loopholes: a watertight argument
3.
kept separate from other subjects or influences: different disciplines are often thought of in watertight compartments
Derived Forms
watertightness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for watertight
adj.

late 14c., from water (n.1) + tight. Figurative use from 1640s.

Online Etymology Dictionary, © 2010 Douglas Harper
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